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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Proxy AMI-related calls from cloud controller to objectstore service."""
import binascii
import os
import shutil
import tarfile
import tempfile
from xml.etree import ElementTree
import boto.s3.connection
import eventlet
from nova import crypto
from nova import exception
from nova import flags
from nova import image
from nova import log as logging
from nova import utils
from nova.api.ec2 import ec2utils
LOG = logging.getLogger("nova.image.s3")
FLAGS = flags.FLAGS
flags.DEFINE_string('image_decryption_dir', '/tmp',
'parent dir for tempdir used for image decryption')
flags.DEFINE_string('s3_access_key', 'notchecked',
'access key to use for s3 server for images')
flags.DEFINE_string('s3_secret_key', 'notchecked',
'secret key to use for s3 server for images')
class S3ImageService(object):
"""Wraps an existing image service to support s3 based register."""
def __init__(self, service=None, *args, **kwargs):
self.service = service or image.get_default_image_service()
self.service.__init__(*args, **kwargs)
def create(self, context, metadata, data=None):
"""Create an image.
metadata['properties'] should contain image_location.
"""
image = self._s3_create(context, metadata)
return image
def delete(self, context, image_id):
self.service.delete(context, image_id)
def update(self, context, image_id, metadata, data=None):
image = self.service.update(context, image_id, metadata, data)
return image
def index(self, context):
return self.service.index(context)
def detail(self, context):
return self.service.detail(context)
def show(self, context, image_id):
return self.service.show(context, image_id)
def show_by_name(self, context, name):
return self.service.show_by_name(context, name)
@staticmethod
def _conn(context):
# NOTE(vish): access and secret keys for s3 server are not
# checked in nova-objectstore
access = FLAGS.s3_access_key
secret = FLAGS.s3_secret_key
calling = boto.s3.connection.OrdinaryCallingFormat()
return boto.s3.connection.S3Connection(aws_access_key_id=access,
aws_secret_access_key=secret,
is_secure=False,
calling_format=calling,
port=FLAGS.s3_port,
host=FLAGS.s3_host)
@staticmethod
def _download_file(bucket, filename, local_dir):
key = bucket.get_key(filename)
local_filename = os.path.join(local_dir, filename)
key.get_contents_to_filename(local_filename)
return local_filename
def _s3_parse_manifest(self, context, metadata, manifest):
manifest = ElementTree.fromstring(manifest)
image_format = 'ami'
image_type = 'machine'
try:
kernel_id = manifest.find('machine_configuration/kernel_id').text
if kernel_id == 'true':
image_format = 'aki'
image_type = 'kernel'
kernel_id = None
except Exception:
kernel_id = None
try:
ramdisk_id = manifest.find('machine_configuration/ramdisk_id').text
if ramdisk_id == 'true':
image_format = 'ari'
image_type = 'ramdisk'
ramdisk_id = None
except Exception:
ramdisk_id = None
try:
arch = manifest.find('machine_configuration/architecture').text
except Exception:
arch = 'x86_64'
# NOTE(yamahata):
# EC2 ec2-budlne-image --block-device-mapping accepts
# <virtual name>=<device name> where
# virtual name = {ami, root, swap, ephemeral<N>}
# where N is no negative integer
# device name = the device name seen by guest kernel.
# They are converted into
# block_device_mapping/mapping/{virtual, device}
#
# Do NOT confuse this with ec2-register's block device mapping
# argument.
mappings = []
try:
block_device_mapping = manifest.findall('machine_configuration/'
'block_device_mapping/'
'mapping')
for bdm in block_device_mapping:
mappings.append({'virtual': bdm.find('virtual').text,
'device': bdm.find('device').text})
except Exception:
mappings = []
properties = metadata['properties']
properties['project_id'] = context.project_id
properties['architecture'] = arch
if kernel_id:
properties['kernel_id'] = ec2utils.ec2_id_to_id(kernel_id)
if ramdisk_id:
properties['ramdisk_id'] = ec2utils.ec2_id_to_id(ramdisk_id)
if mappings:
properties['mappings'] = mappings
metadata.update({'disk_format': image_format,
'container_format': image_format,
'status': 'queued',
'is_public': False,
'properties': properties})
metadata['properties']['image_state'] = 'pending'
image = self.service.create(context, metadata)
return manifest, image
def _s3_create(self, context, metadata):
"""Gets a manifext from s3 and makes an image."""
image_path = tempfile.mkdtemp(dir=FLAGS.image_decryption_dir)
image_location = metadata['properties']['image_location']
bucket_name = image_location.split('/')[0]
manifest_path = image_location[len(bucket_name) + 1:]
bucket = self._conn(context).get_bucket(bucket_name)
key = bucket.get_key(manifest_path)
manifest = key.get_contents_as_string()
manifest, image = self._s3_parse_manifest(context, metadata, manifest)
image_id = image['id']
def delayed_create():
"""This handles the fetching and decrypting of the part files."""
log_vars = {'image_location': image_location,
'image_path': image_path}
metadata['properties']['image_state'] = 'downloading'
self.service.update(context, image_id, metadata)
try:
parts = []
elements = manifest.find('image').getiterator('filename')
for fn_element in elements:
part = self._download_file(bucket,
fn_element.text,
image_path)
parts.append(part)
# NOTE(vish): this may be suboptimal, should we use cat?
enc_filename = os.path.join(image_path, 'image.encrypted')
with open(enc_filename, 'w') as combined:
for filename in parts:
with open(filename) as part:
shutil.copyfileobj(part, combined)
except Exception:
LOG.exception(_("Failed to download %(image_location)s "
"to %(image_path)s"), log_vars)
metadata['properties']['image_state'] = 'failed_download'
self.service.update(context, image_id, metadata)
return
metadata['properties']['image_state'] = 'decrypting'
self.service.update(context, image_id, metadata)
try:
hex_key = manifest.find('image/ec2_encrypted_key').text
encrypted_key = binascii.a2b_hex(hex_key)
hex_iv = manifest.find('image/ec2_encrypted_iv').text
encrypted_iv = binascii.a2b_hex(hex_iv)
# FIXME(vish): grab key from common service so this can run on
# any host.
cloud_pk = crypto.key_path(context.project_id)
dec_filename = os.path.join(image_path, 'image.tar.gz')
self._decrypt_image(enc_filename, encrypted_key,
encrypted_iv, cloud_pk,
dec_filename)
except Exception:
LOG.exception(_("Failed to decrypt %(image_location)s "
"to %(image_path)s"), log_vars)
metadata['properties']['image_state'] = 'failed_decrypt'
self.service.update(context, image_id, metadata)
return
metadata['properties']['image_state'] = 'untarring'
self.service.update(context, image_id, metadata)
try:
unz_filename = self._untarzip_image(image_path, dec_filename)
except Exception:
LOG.exception(_("Failed to untar %(image_location)s "
"to %(image_path)s"), log_vars)
metadata['properties']['image_state'] = 'failed_untar'
self.service.update(context, image_id, metadata)
return
metadata['properties']['image_state'] = 'uploading'
self.service.update(context, image_id, metadata)
try:
with open(unz_filename) as image_file:
self.service.update(context, image_id,
metadata, image_file)
except Exception:
LOG.exception(_("Failed to upload %(image_location)s "
"to %(image_path)s"), log_vars)
metadata['properties']['image_state'] = 'failed_upload'
self.service.update(context, image_id, metadata)
return
metadata['properties']['image_state'] = 'available'
metadata['status'] = 'active'
self.service.update(context, image_id, metadata)
shutil.rmtree(image_path)
eventlet.spawn_n(delayed_create)
return image
@staticmethod
def _decrypt_image(encrypted_filename, encrypted_key, encrypted_iv,
cloud_private_key, decrypted_filename):
key, err = utils.execute('openssl',
'rsautl',
'-decrypt',
'-inkey', '%s' % cloud_private_key,
process_input=encrypted_key,
check_exit_code=False)
if err:
raise exception.Error(_('Failed to decrypt private key: %s')
% err)
iv, err = utils.execute('openssl',
'rsautl',
'-decrypt',
'-inkey', '%s' % cloud_private_key,
process_input=encrypted_iv,
check_exit_code=False)
if err:
raise exception.Error(_('Failed to decrypt initialization '
'vector: %s') % err)
_out, err = utils.execute('openssl', 'enc',
'-d', '-aes-128-cbc',
'-in', '%s' % (encrypted_filename,),
'-K', '%s' % (key,),
'-iv', '%s' % (iv,),
'-out', '%s' % (decrypted_filename,),
check_exit_code=False)
if err:
raise exception.Error(_('Failed to decrypt image file '
'%(image_file)s: %(err)s') %
{'image_file': encrypted_filename,
'err': err})
@staticmethod
def _untarzip_image(path, filename):
tar_file = tarfile.open(filename, 'r|gz')
tar_file.extractall(path)
image_file = tar_file.getnames()[0]
tar_file.close()
return os.path.join(path, image_file)
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